Add ability to enable 'debug' property in JAAS configuration
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Key: HADOOP-7189
URL: https://issues.apache.org/jira/browse/HADOOP-7189
Project: Hadoop Common
Issue Type: Improvement
Components: security
Affects Versions: 0.23.0
Reporter: Todd Lipcon
Priority: Minor
Occasionally users have run into weird "Unable to login" messages.
Unfortunately, JAAS obscures the underlying exception message in many cases
because it thinks leaking the exception might be insecure in itself. Enabling
the "debug" option in the JAAS configuration gets it to dump the underlying
issue and makes troubleshooting this kind of issue easier.
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